Compile paging inline

app/src/main/java/androidx/paging/TiledDataSource.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package androidx.paging;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.RestrictTo;
+import androidx.annotation.WorkerThread;
+
+import java.util.Collections;
+import java.util.List;
+
+// NOTE: Room 1.0 depends on this class, so it should not be removed until
+// we can require a version of Room that uses PositionalDataSource directly
+/**
+ * @param <T> Type loaded by the TiledDataSource.
+ *
+ * @deprecated Use {@link PositionalDataSource}
+ * @hide
+ */
+@SuppressWarnings("DeprecatedIsStillUsed")
+@Deprecated
+@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
+public abstract class TiledDataSource<T> extends PositionalDataSource<T> {
+
+    @WorkerThread
+    public abstract int countItems();
+
+    @Override
+    boolean isContiguous() {
+        return false;
+    }
+
+    @Nullable
+    @WorkerThread
+    public abstract List<T> loadRange(int startPosition, int count);
+
+    @Override
+    public void loadInitial(@NonNull LoadInitialParams params,
+            @NonNull LoadInitialCallback<T> callback) {
+        int totalCount = countItems();
+        if (totalCount == 0) {
+            callback.onResult(Collections.<T>emptyList(), 0, 0);
+            return;
+        }
+
+        // bound the size requested, based on known count
+        final int firstLoadPosition = computeInitialLoadPosition(params, totalCount);
+        final int firstLoadSize = computeInitialLoadSize(params, firstLoadPosition, totalCount);
+
+        // convert from legacy behavior
+        List<T> list = loadRange(firstLoadPosition, firstLoadSize);
+        if (list != null && list.size() == firstLoadSize) {
+            callback.onResult(list, firstLoadPosition, totalCount);
+        } else {
+            // null list, or size doesn't match request
+            // The size check is a WAR for Room 1.0, subsequent versions do the check in Room
+            invalidate();
+        }
+    }
+
+    @Override
+    public void loadRange(@NonNull LoadRangeParams params,
+            @NonNull LoadRangeCallback<T> callback) {
+        List<T> list = loadRange(params.startPosition, params.loadSize);
+        if (list != null) {
+            callback.onResult(list);
+        } else {
+            invalidate();
+        }
+    }
+}